Thermostatically controlled fuel enrichment device



w. E. HAAsT Dec. 26, 1939.

THERMOSTATICALLY CONTROLLED FUEL .ENRICHMENT DEVICE Filed May 3, 1959 WILLIAM E. HAAST.

INVENTOR ATTORNEY Patented Dec. 26, 1939 UNlTED- STATES PATENT oFFicE T HEBMOS'IA'IICALLY CONTROLLED FUEL ENRICHIWENT DEVICE William E. Haast, Hawthorne, N. J. P Application Mja'y a. 1939, sermno. 271,405

- 101mm. (Cl.12 3119) r I device thermostatically controlled by the cooling water temperature whereby the maximum temperature reached would be approximately 212 degreesFahrenheit. Another object of my invention is to provide a dual means for fuelenrich ment whereby the admission of gas to the intake manifold is independentof the opening or closing of the throttle. In short I propose to introduce an additional supply of gas either through an auxiliary nozzle located in the Venturisection of the carburetor above the throttle butterfly valve when open, or by admitting gas into the manifold directly below the throttle butterfly when closed. In,both cases the additional gas supply will be controlled by a thermostatic valve actuated by the changes in temperature of the cooling water.

The full objects andadvantages of my invention will appear in the detailed description when studied in conjunction with the drawing, and the novel features of the invention are pointed out in the appended claim.

In the drawing illustrating my invention,--. Fig. 1 is a front elevational view partly in section showing the proposed fuel enrichment system.

. Fig. 2 is an enlarged side elevational view of the U shaped bracket.

Fig. 3 is an enlarged side elevational view of the thermostat and needle valve stem.

In detail a carburetor I is provided with a standard fuel feed nozzle 5 connected to the float reservoir 2 and positioned in a'venturi 3. The

' as will be fed to said nozzles. In other words the intake either *through I auxiliary nozzle I2 in the Venturi section or the, idling nozzle ll located below the throttle butterfly 8; During the interval of starting the 'motor and the short v period after starting andwhile the motor is still 5 cold the operator may either close or open the throttle by operating the accelerator. When the accelerator is depressed the motor draws air through the strainer 4, and past the standard feed nozzle 5. The rush of air passing the nozzle l0 '5 picks up gas from said nozzle to form a combustible mixture.

In the operation of starting the motor the speed is usually so slow, and consequently the suction solo'w, that an insuflfcient amount of gas for starting a cold motor is picked 15 up from the standard nozzle 5. By providing an auxiliary nozzle l2 relatively in the same position in the venturi as the main fuel nozzle 5, and

adapted to work in conjunction therewith during the period the motor is cold, a greater supply of 20 gas is provided for starting the cold motor dueto the additional nozzle. Y I

On the other hand if the accelerator is not depressed, so little air will be drawn past the nozzles 5 and 12 that there be insufficient fuel to form a rich enough mixture for'starting a cold motor. In that case the butterfly 6 will remain closed and any suction or negative pressure developed by the motor will be confined to. t e manifold below the butterfly throttle. The idling nozzle 14 being located in thesection or, the intake manifold below the butterfly 6, will be under suction and as a result gas will be drawn through the fuel line l3 to provide a rich enough mixture for starting or running during the idling period of a cold motor.

The thermostatic fuel valve to which the auxiliary' nozzles I2 and [4 are connected by fuel lines H and 13, controls the period over which 0 the needle valve comprising stem 18 and seat 23 will remain open while the motor is cold, and" as the cooling water in the block is heated the valve will close and the fuel enrichment efiect 5 will stop. The valve 9 comprises a main bushing l5 adapted to fit into the motor block l6.. A thermostatic bellows I1 is carried on a U shaped bracket l9 and projects through the top of the motor block I6 into the water jacket space 20. The bracketfeet 25 are detachably fastened to the base of the bushing l5. By this type of assembly the thermostatic element can be readily replaced if desired. A valve "bushing 22 provided with theneedle valve seat 23 is sealed in '55 auxiliary nozzle or orifice I! at the same time.

the top of the main bushing i5 thereby pr viding a chamber 24 for the gas. The auxiliary upply line ll supplies gas from the carburetor rvolr 2 to the chamber 24 of the valve 8. If the motor is cold the needle valve It remains of! its seat 23 and the gas is thereby permitted to flow through the auxiliary feedlines II and I! to the auxiliary nozzles i2 and I4.

As explained above when the butterfly valve 8 is open, gas will be drawn from the main nozzle 5 and in addition a surplus supply necessary for starting a cold motor will be drawn from the On the other hand if the butterfly valve 8 is closed, the suction produced in the manifold between the butterfly valve 6 and motor, where the idling nozzle ll is located, will draw gas through thefuel line llinto the motor as long as thethermostatic valve 9 is open during cold motor temperatures. Further, in the first case, that is when the butterfly valve 6' is open, I: addition to gas being drawn from the main. nozzle I and auxiliary nozzle I2, fuel is also drawn into the manifold from nozzle ll due to the slight negative pressure set up. in the manifold even when the throttle is open.

I claim:

A fuel enrichment device for water cooled motors comprising a standard carburetor provided with a venturi, a butterfly throttle valve adjacent the carburetor at the entrance to the intake manifold, a main fuel supply nozzle located in said venturi and connected through the main fuel supply line directly to the carburetor, an auxiliary fuel nozzle located in the venturi for the enrichment of the fuel supply when the throttle is open and during cold motor operations, an aux? iliary fuel nozzle located in the intake manifold adjacent said butterfly valve for the enrichment of the fuel supply during cold motor operation with a closed throttle, an auxiliary fuel supply line connecting said auxiliary fuel nozzles to the carburetor, and a thermostatically operated valve in the auxiliary fuel supply line actuated by the change in temperature of the motor cooling water for cutting off the supply of fuel to said auxiliary nozzles when the motor warms up.

WILLIAM E. HAAST. 

